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[Discuss-gnuradio] question on sample rate and ethernet rate

From: Achilleas Anastasopoulos
Subject: [Discuss-gnuradio] question on sample rate and ethernet rate
Date: Wed, 24 Apr 2019 22:05:33 -0400

Hi all,

I am trying to figure out what I am doing/thinking wrong in the following example:

I have a simple flowgraph with a complex source sending samples to USRP.
The sample rate is fs=200e6/32=6.25 Msps which is the parameter that I set in the USRP.

I assume that this parameter will result in fs x 8 =  50 MBytes/sec transmission
over the ethernet (2 complex samples and float32 (4 bytes) each. This is the format that I have set in USRP).

However, when I observe the transmission rate on the system monitor (Ubuntu Linux) it reports a sustained rate of exactly half of it, ie, 25 MBytes/sec.

I cannot figure out what I am doing wrong and I get this factor of 2 mismatch.
All the above is run in an ubuntu box with gnuradio maint-3.7 installed and uhd 3.14.0

thanks in advance for any explanation,

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